Improvement in pipe-wrenches



L. GLYNN.

Pipe-Wrench No. 203,261. Patented May 7, 1878.

UNITED STATES PATENT OFFICE.

LAWRENCE GLYNN, OF CAMBEmcEPonT, MASSACHUSETTS.

IMPROVEM ENT IN Pl PE-WRENCHES.

Specification forming part of Letters Patent N0. 203,261, dated May 7,1878; application filed March 25, 1878.

To all whom it may concern I the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art towhich it appertain's-to make and use the same, reference being had tothe accompanying drawings, and to letters of refer; ence marked thereon,which form a part of this specification.

My invention relates to improvements in nut and pipe-wrenches; andconsists of the combination of the following parts, viz: A stationaryserrated jaw the shank of which is provided with a handle in the usualway, a stationary slotted frame secured to the shank of the stationaryjaw, an egg-shaped nut capable of lateral adjustment within a horizontalslotted opening in the aforesaid stationary frame, and a movableserrated jaw having a screw-threaded shank passing through verticalslotted openings in the stationary frame and operated by means of theadjustable eggshaped nut.

A spring is located between the stationary shank and the adjustableshank, so as to keep the serrated jaws of the wrench extended from eachother when not in use. The serrated edges of the stationary jaw are madepointing outward from the movable-jaw shank, and the serrated edges ofthe movable jaw are made pointing in an opposite direction, so as tomore firmly grasp and hold the nut, pipe, or

other object operated upon.

By this arrangement I construct a wrench of very few parts, all verystrong and durable, and not liable to breakage, without any hingeswhatever, as th e swinging motion of the movable jaw is obtained by thelateral oscillating motion of the egg-shaped nut within its horizontalslot in the stationary frame that is secured to the shank of thestationary jaw.

In the accompanying drawings, Figure 1 represents a vertical section ofmy improved wrench, and Fig. 2 represents a cross-section on the line AB shown in Fig. 1.

Similar letters refer to similar parts wherever they occur in thedrawings.

a is the stationary jaw, with its teeth a a) r a pointing outward, asshown. b is the shank of the stationary jaw, secured to the handle 0. dis the slotted frame secured by rivets, &c., to the stationary shank b,or made in one piece with it. The frame cl is provided with thehorizontal slot or opening aim the reception of the egg-shaped nut f,that is capable of lateral motion within said slot during the operationof the wrench. 9 represents the movable jaw with its serrated edges g gg, pointing inward, as shown. h is the screw-threaded shank of themovable jaw 'g, which shank is flattened on two opposite sides, asshown, and inserted through the flattened vertical slots or openings 6 iin the stationary frame d, so as to prevent said shank from turningaround its axis when operated by the egg-shaped nut f that surrounds it.It is the spring secured to the shank b, and resting loosely against theinside of the movable shank h, or vice versa,

for the purpose setforth.

What I wish to secure by Letters Patent, and claim, is- I Theherein-described wrench, consisting of the stationary jaw and shank a b,the stationary frame d, with its slots 0 t z', the egg-shaped nut f, themovable shank and jaw h g, and spring k, as and for the purpose setforth.

Intestimony that I claim the foregoing as my own invention I haveaffixed my signature in presence of two witnesses.

LAWRENCE GLYNN.

Witnesses:

ALBAN ANDREN, HENRY OHADBOURN.

